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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b04b340586bcfa8925e7fd1f72afea486c45b806b4e3df6fc30c6932a792329' 
  AND token = '82bVU/WEim/+SAfrTSj0DgPl0BDwisBbujYfwtUBjls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}